Malicious PDF — malware analysis report

Static analysis result for SHA-256 c770dd91722b3966…

MALICIOUS

PDF

73.2 KB Created: 2021-03-23 16:29:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c6acbb4929c91ebbf4f6ddff28253b2c SHA-1: 3dc9df5d7916e4865973a17a6e129ca94b6428de SHA-256: c770dd91722b3966f3709d9344915bae148beb80999fcb8cea84eaa2cf7c2308
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or redirection scheme. The presence of external URIs and the overall structure strongly indicate an attempt to redirect the user to malicious content, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/wix?keyword=anatomy+and+physiology+lab+1+assignment+1 PDF link annotation
    • https://cdn.sqhk.co/luwesefizi/FWhfhhC/auto_chess_war_mod_apk_diamond.pdfIn PDF document text
    • http://propovar.ru/osmosis_worksheet_biologycufcr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368495/normal_601a45da90716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416789/normal_60558e521cb2d.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/ij7LYhd/forgotten_weapons_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/perigupa/niahfic/knives_out_review_common_sense_media.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472206/normal_603a004821b98.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/zuxoviweviwiwovose6cvv.pdfIn PDF document text
    • http://ompala.store/rexewujopuxanakiwrnni.pdfIn PDF document text
    • http://postel-na-zakaz.ru/chemistry_structure_and_properties_solutions_manualpr3hz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384152/normal_5fd0e213b484f.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/CGRggdG/1206312134.pdfIn PDF document text
    • http://tramlaweq.online/morrison_and_boyd_organic_chemistry3p3tx.pdfIn PDF document text
    • http://getcreditreport.info/ucr_uniform_crime_report_definition0ie87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465151/normal_5fd6217ab754e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wemazun/jodekexozokitotaw.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/anomalous_behaviour_of_water_information.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/no_homework_pass_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/kapovarijaliko.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/18564378488.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE33 5560 bytes
SHA-256: 111dccb48e6b679ca41b1e8ce3f07016b36fbaec2152042b1eb811ba6d4e1200
font_01_sfnt_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 11528 bytes
SHA-256: e7f844fad113309fc1cc7fa77e97c71cd614816619722f30ff7c9b86c1dc8578

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